Apparatus for cleaning filter-beds.



Z. VONYWESSELY.

A APPARATUS POR CLEANING FILTER BEDS.

APPLIUATION FILED 1171114. 190s.

944,5, Patented Dec. 28, 1909.

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` Z. VON WBSSBLY. APPARATUS POB CLEANING FILTER BEDS. APPLICATION FILED JULY 14. 190s.

2 SHEETS-SHEET 2 Of-Zwn/Q WW W55 Patented Dec. 28, i909.

' UNTED STATES PATENT OFFTCE.

ZDENKO VON WESSELY, PRAGUE, AUSTRIA-HUNGARY.

APPARATUS FOR CLEANING FILTER-BEDS.

atenas.

I0 all whom t may concern:

Be it known that I, ZDENKO voN VVEssELY, subj ect of the Emperor of Austria-Hungary, residing at Prague, in the Empire of Austria-Hungary, have invented certain new and useful Improvements in Apparatus for Cleaning Filter-Beds, for which application has been made in Germany, dated 25th February, 1907.

This invention relates to an improved ap paatus for use in cleaning the sand of filter be s.

The apparatus is shown in the accompanying drawings in which Figure 1 is a plan view; Fig. 2, a cross section; and Fig. 3, a longitudinal section of the apparatus.

The flushing pipes a and b lie at equal distances apart. Apertures 0 are formed on both sides of the pipes in a horizontal plane drawn through the axes of the pipes; the outermost pipes lying along the walls are perforated on one side only. The flushing pipes are held fast exactly in a horizontal position by bearings in the inclosing walls and by supports S. The unfiltered water is admitted in any suitable way to the filter and collects as filtered water in the longitudinal channels 7c (Fig. 2), which are interconnected with cross passages, so that the filtered water may be carried o through the collecting pipe c (Figs. 1 and 3). For carrying off the dirty water, overflow gutters f (Figs. l and 2) are provided along the walls of the filter, which are connected by overflow pipes r/ with discharge pipes h (Figs. 1 and 2), which are adapted to be shut off'.

VJhen the surface of the sand of the lter is to be cleaned and any filter film deposited thereon removed, the water level is first lowered in the filter, so that the fiushing pipes stand at a small distance below the level, the said pipes being normally at the upper surface of the sand. The height of the upper edges of the overflow gutters above the horizontal surface of the filtering sand must be selected a small distance above the Hush pipes. Then water or air is forced in through the systems of flushing pipes a and Z) alternately until the upper filter layers of sand have reached the desired degree of purity. The flushing water in rising carries up the impurities and removes them Specification of Letters Patent.

Application flied July 14, 1908.

Patented Deo. 28, 1909.

seran No. 443,539.

from the filter in flowing over through the gutters 7.

It is recommended that the last flushing should be made with the flushing pipes b. The water or air emerging, for instance, from the pipes a throws the sand situated there laterally, while a hollowing out takes place beneath the pipes a by the hydraulic acticn of the movement of the water produced by the action of the emergent jets. The ejected quantity of sand lodges on the adjacent pipes Z), which are not in operation. Now if after shutting off the flushing pipes ci, the flushing pipes Z) be set in operation, the sand deposited over these pipes Z) (sand ridges) will be thrown back into the sand hollows previously formed. Thus by the alternate discharge of water or air under pressure from the two series of pipes, the sand is thrown to and fro from one flushing pipe to the other until it has reached the desired degree of purity. During the flushing, the level of the water in the filter gradually rises and after the stoppage ofk the flushing through the system of pipes, pure water is admitted through the discharge channels 7c, until the dirty water located above the surface of the sand has run off through the overflow gutters f and the discharge pipes h. The pipes are arranged parallel with the sides, if the purifying of thesand is to be effected in vessels of a rectilinear shape.

I declare that what I claim is Apparatus for cleaning filter beds comprising separate headers, two sets of flushing pipes connected to said headers, and being alternately operable thereby, provided with uniform lateral perforations at opposite sides only, approximately in the horizontal plane of the sand of the filter bed, and adapted to throw the sand into alternate mounds and hollows, and means for supplying cleansing fiuid alternately to said two sets of pipes, from the separate headers, substantially as described and shown.

In witness whereof, I have hereunto signed my name this 30th day of June 1908,

in the presence of two subscribing witnesses.

ZDENKO VON WESSELY.

Witnesses ROBERT V. HEINGARTNER, AUGUST FUGGER. 

